First Lady Michelle Obama sings along to "Lets Stay Together" performed by Jennifer Hudson while dancing with US President Barack Obama during the Inaugural Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

US-POLITICS-INAUGURATION-BALLS

First Lady Michelle Obama sings along to "Lets Stay Together" performed by Jennifer Hudson while dancing with US President Barack Obama during the Inaugural Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. AFP PHOTO/MANDEL NGAN (Photo credit should read MANDEL NGAN/AFP/Getty Images)

WASHINGTON, DC - JANUARY 21: President Barack Obama and first lady Michelle Obama dance together at the Commander-in-Chief's Inaugural Ball at the Washington Convention Center January 21, 2013 in Washington, DC. The president was sworn-in for his second term in office earlier in the day. (Photo by Pablo Martinez Monsivais-Pool/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: President Barack Obama and first lady Michelle Obama walk on stage for their first dance together at the Commander-in-Chief's Inaugural Ball at the Washington Convention Center January 21, 2013 in Washington, DC. The president was sworn-in for his second term in office earlier in the day. (Photo by Pablo Martinez Monsivais-Pool/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Singer Alicia Keys performs during the Public Inaugural Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. U.S. President Barack Obama was sworn in for his second term earlier in the day. (Photo by Mario Tama/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Recording artist Alicia Keys performs during the Commander-In-Chief Ball celebrating the inauguration of U.S. President Barack Obama at the Walter Washington Convention Center January 21, 2013 in Washington, DC. President Obama started his second term by taking the Oath of Office earlier in the day during a ceremony on the West Front of the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Recording artist Alicia Keys performs during the Commander-In-Chief Ball celebrating the inauguration of U.S. President Barack Obama at the Walter Washington Convention Center January 21, 2013 in Washington, DC. President Obama started his second term by taking the Oath of Office earlier in the day during a ceremony on the West Front of the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images)

US-POLITICS-INAUGURATION-BALLS

US President Barack Obama and First Lady Michelle Obama attend the Commander and Chief Ball at the Washington Convention Center January 21, 2013 in Washington, DC. Obama and Biden attended Inauguration balls after being ceremonially sworn in for a second term leading the United States earlier today. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

US-POLITICS-INAUGURATION-BALLS

US President Barack Obama and First Lady Michelle Obama dance with service members during the Commander and Chief Ball at the Washington Convention Center January 21, 2013 in Washington, DC. Obama and Biden attended Inauguration balls after being ceremonially sworn in for a second term leading the United States earlier today. AFP PHOTO/Brendan SMIALOWSKI (Photo credit should read BRENDAN SMIALOWSKI/AFP/Getty Images)

US-POLITICS-INAUGURATION-SWEARING IN-OBAMA

US First lady Michelle Obama walks through the crypt on her way to watch US President Barack Obama get sworn-in for a second term along with President Barack Obama, by Supreme Court Chief Justice John Roberts during his public inauguration ceremony at the U.S. Capitol Building in Washington, D.C. on January 21, 2013. AFP PHOTO / POOL / Molly RILEY (Photo credit should read MOLLY RILEY/AFP/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: Actor and recording artist Jennifer Hudson sings during the Commander-In-Chief Ball celebrating the inauguration of U.S. President Barack Obama at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Obama took the oath of office for his second term earlier in the day during a ceremony on the West Front of the U.S. Capitol. (Photo by Chip Somodevilla/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: The band fun. performs during the Inaugural Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. President Obama was sworn in for his second term earlier in the day. (Photo by Mario Tama/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: Musician Alicia Keys performs at the Commander-in-Chief Ball before the arrival of U.S. President Barack Obama and first lady Michelle Obama on January 21, 2013 in Washington, DC. U.S. President Barack Obama was sworn-in for his second term as president during a public ceremonial inauguration earlier in the day. (Photo by Justin Sullivan/Getty Images)

President Obama And first lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Alicia Keys sings before the arrival of US President Barack Obama to the Commander-In-Chief's Inaugural Ball January 21, 2013 in Washington, DC. Obama was sworn in today for his second term in a public ceremonial swearing in. (Photo by Joe Raedle/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama (R) delivers remarks at the Commander-in-Chief Ball on January 21, 2013 in Washington, DC. Pres. Obama was sworn-in for his second term as president during a public ceremonial inauguration earlier in the day. (Photo by Justin Sullivan/Getty Images)

US-POLITICS-INAUGURATION-BALLS

US President Barack Obama and First Lady Michelle Obama attend the Commander-in-Chief's Ball, honoring US service members and their families, at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

US-POLITICS-INAUGURATION-BALLS

US President Barack Obama and First Lady Michelle Obama attend the Commander-in-Chief's Ball, honoring US service members and their families, at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

US-POLITICS-INAUGURATION-BALLS

US President Barack Obama and First Lady Michelle Obama attend the Commander-in-Chief's Ball, honoring US service members and their families, at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

US-POLITICS-INAUGURATION-BALLS

US President Barack Obama and First Lady Michelle Obama attend the Commander-in-Chief's Ball, honoring US service members and their families, at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. AFP PHOTO/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Singer Jamie Foxx performs during the during the Commander-In-Chief's Inaugural Ball January 21, 2013 in Washington, DC. President Barack Obama is scheduled to show up at the ball after being sworn in today for his second term in a public ceremonial swearing in. (Photo by Joe Raedle/Getty Images)

DC Celebrates Inauguration With Gala Balls

(Credit: Chip Somodevilla/Getty Images)

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama and first lady Michelle Obama sing together as they dance during the Inaugural Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Obama was sworn-in for his second term of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Singer Marc Anthony performs during the Commander-In-Chief's Inaugural Ball January 21, 2013 in Washington, DC. President Barack Obama is scheduled to show up at the ball after being sworn in today for his second term in a public ceremonial swearing in. (Photo by Joe Raedle/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: The band fun. performs during the Commander-in-Chief's Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. President Obama was sworn-in for his second term earlier in the day. (Photo by Alex Wong/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama bows to first lady Michelle Obama before they dance during the Comander-in-Chief's Inaugural Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Obama was sworn-in for his second term of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama and first lady Michelle Obama arrive for the Comander-in-Chief's Inaugural Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Obama was sworn-in for his second term of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. Vice President Joe Biden (L) and Dr. Jill Biden wave goodbye after actor and musician Jamie Foxx (R) sang while they danced at the Comander-in-Chief's Inaugural Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Biden and President Barack Obama each took their oath of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. Vice President Joe Biden and Dr. Jill Biden dance during the Comander-in-Chief's Inaugural Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Biden and President Barack Obama each took their oath of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama and first lady Michelle Obama dance together during the Comander-in-Chief's Inaugural Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Obama was sworn-in for his second term of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

DC Celebrates Inauguration With Gala Balls

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama (R) thanks (L-R) Sergeant Major of the Army Raymond Chandler, Sergeant Major of the Marine Corps Micheal Barrett, Master Chief Petty Officer of the Navy Michael Stevens, Chief Master Sergeant of the Air Force James Roy and Master Chief Petty Officer of the Coast Guard Michael Leavitt during the Commander-In-Chief Ball at the Walter Washington Convention Center January 21, 2013 in Washington, DC. Obama was sworn-in for his second term of office earlier in the day. (Photo by Chip Somodevilla/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: U.S. President Barack Obama dances with first lady Michelle Obama during the Inaugural Ball January 21, 2013 at Walter E. Washington Convention Center in Washington, DC. The president was sworn-in for a second term earlier in the day. (Photo by Alex Wong/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Singer Jennifer Hudson performs during the Inaugural Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. U.S. President Barack Obama was sworn-in for a second term earlier in the day. (Photo by Alex Wong/Getty Images)

President Obama And First Lady Attend Inaugural Balls

WASHINGTON, DC - JANUARY 21: Singer Brad Paisley performs during the Inaugural Ball at the Walter E. Washington Convention Center on January 21, 2013 in Washington, DC. U.S. President Barack Obama was sworn-in for a second term earlier in the day. (Photo by Alex Wong/Getty Images)